All of these examples of avian engineering reveal evolution at work. To look closely at bird nests is to glimpse the wondrous ways that species have adapted to particular places, materials, and methods for ensuring the survival of the next generation.

Loss of habitat is high on the list of reasons that bird species are suffering worldwide, and only time will tell whether these architects can adapt their creations quickly enough to keep up with the changes. In the meantime, Peter Goodfellow's book Avian Architecture is a testament to the beauty of birds and the impressive homes they create.